Emery-wheel dresser



Oct. 30, 1928. 1,689,930 N R. P. PLACE EMERY WHEEL DRES SER Filed Feb.1925 WITNESSES.-

INVENTOI? fly/[M4 7 M A TTOR/VEY fatentecl Oct. 30, 1928 ROLAND P.PLACE, OF MIDLAND, MICHIGAN.

EMERY-WHEEL DRESSER.

Application filed February 9, 1925. Serial No. 7,804. i

This invention relates to the construction of rotatable dressing cuttersfor emery wheels and its object to produce bearings for a de-. vice ofthis character which will eliminate the objectionable chattertsocommonly experienced when dressing tools are in use which chatterresults in high spots and ridges on the surfaces being dressed.

In the accompanying drawing, Fig. 1 is an end elevation of a dressingcutter and a section of the holder therefor. 2 is a longitudinal sectionof the cutter and of the support. Fig. 3 is an elevation of the cutterands section of the support showing a slight modification of the shafton which the cutter is mounted. Fig. 4 is a section and Fig. 5 is anelevation of a bushing. Fig. 6 is an elevation and a section of a springwasher on the line w-:c.

parts throughout the several views.

1 have found that when the rotary cutters of dressing tools for grindingwheels are not positively prevented from moving laterally relative tothe axes of the cutters that chat,- tering occurs which results in highspots and ridges being formed on the surfaces being dressed, and thatthis may occur even when the slackness'of the bearings and of the cuttershaft in the holder is no more than a few thousandths of an inch. It isfor this reason that the head 1 of the holder is formed with taperingholes 2 and 3, andtrat the head 41- of the shaft 5 is turned to fit thehole 2,

while a tapering and splitbushing 6 fits the der pressure. The bearingrings 10 are Similar reference characters refer to like The rm gs, the

pressed into the barrel 11 on which the starshaped cutters 12 are heldby the nut 13, the latter being held in place by thewell known lockwasher 14 having a finger 15. I prefer to use the sleeve 8' be *ause itrenders assembly and replacement more convenient.

Thin washers 17- lit the rings 9 and prevent the entrance of dust to thespaces between the balls 18. Other washers 19 are slidable on 'the shaftand contact with the bearing rings 9 and are pushed toward each other bythe spring washers 20 which lie against the inner sides of the ends 21of the holder and are provided with wings 22 that press against thewashers 19. These washers 19 also assist in preventing the entrance ofdust; These spring washers are tempered to have sufficient initialstiffness, the central holes being so large that the washer will notContact with the tapering head 4c of the bolt or with the ta peringbushing 65, as shown in Fig. 3, or the holes 23 may be smaller so thatwhen the head 4 and bushing 6 are forced toward each other thewashers 20will be carried with them and the pressure on the bearing rings 9 bethereby increased. In either case, there is no looseness at the ballbearings of the rotary cutter, this being entirely eliminated by therigid shaft andthe constant pressure of the spring washers.

The details and proportions ofthis cutter mounting may all be changed bythose skilled in'the art without departing from the spirit (ill so f

of my invention as set forth'in the following claim.

1 claim In an eniery wheel dresser, the combination of a holder havingside members, a shaft mounted in saidside members, a cutter mounted onthe shaft, ball bearings between the shaft and cutter. washers on theshaft contacting with the inner ring members of said bearings, andcup-shaped resilient metal. washers between said washers and the sidemembers of the holder to automatically adjust said ball bearings.

ROLAND P. PLACE.

